title: Tunability of the optical band edge in thin PbS films chemically deposited on GaAs(100).
abstract: The optical properties of chemical-solution-deposited thin films of lead sulfide (PbS) were investigated using infrared transmission and photoluminescence spectroscopies. The synthesized films are characterized by a wide range of microstructures, from 15 nm nanocrystals up to monocrystals. Energy bandgap values for bulk and nanostructured layers varied from 0.41 eV up to 0.48 eV, respectively. Blueshifts in both absorbance and emission peaks of the nanostructured layers were obtained due to quantum size effects. The optical properties of the films are shown to be size-dependent, with the band edge increasing with temperature.
authors.affiliation: Department of Materials Engineering and the Ilse Katz Institute for Nanoscience and Nanotechnology, Ben-Gurion University of the Negev, Beer-Sheva 84105, Israel.
authors.forename: Anna
authors.initials: A
authors.lastname: Osherov
authors.forename: Janos P
authors.initials: JP
authors.lastname: Makai
authors.forename: Janos
authors.initials: J
authors.lastname: Balazs
authors.forename: Zsolt J
authors.initials: ZJ
authors.lastname: Horvath
authors.forename: Nadav
authors.initials: N
authors.lastname: Gutman
authors.forename: Amir
authors.initials: A
authors.lastname: Sa'ar
authors.forename: Yuval
authors.initials: Y
authors.lastname: Golan
mesh_terms: D000042:Absorption; D001151:Arsenic / Q000737:chemistry*; D003460:Crystallization / Q000379:methods; D005708:Gallium / Q000737:chemistry*; D007259:Infrared Rays; D007854:Lead / Q000737:chemistry*; D049449:Luminescence; D008567:Membranes, Artificial; D008855:Microscopy, Electron, Scanning / Q000379:methods*; D046529:Microscopy, Electron, Transmission / Q000379:methods*; D053758:Nanoparticles / Q000737:chemistry*; D036103:Nanotechnology / Q000379:methods; D055095:Optics and Photonics / Q000295:instrumentation; D010316:Particle Size; D013440:Sulfides / Q000737:chemistry*; D013499:Surface Properties; D013696:Temperature
chemical_list: D008567:Membranes, Artificial; D013440:Sulfides; C018391:lead sulfide; D007854:Lead; D005708:Gallium; D001151:Arsenic